The World Religion Database (WRD) contains detailed statistics on religious affiliation for every country in the world. For each of the world's religions, best estimates at multiple dates for the period 1900 to 2050 are given. The WRD provides access to the sources which underlie the figures in the database, including censuses and surveys. It is constantly updated with new sets of data as they become available. The WRD is developed at the Institute on Culture, Religion and World Affairs (CURA) at Boston University.